Evap SUZUKI JIMNY 2005 3.G Service User Guide

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Abnormal noise from crankshaft pulley
Abnormal noise from tension pulley
Abnormal noise from A/C evaporator
Abnormal noise from blower fan motor
Condition Possible Cause Correction
A large rattling noise
is heard at idle or sud-
den acceleration.Loosen crankshaft pulley bolt. Retighten bolt.
Condition Possible Cause Correction
Clattering noise is
heard from pulley.Worn or damaged bearing. Replace tension pulley.
Pulley cranks upon
contact.Cracked or loose bracket. Replace or retighten bracket.
Condition Possible Cause Correction
Whistling sound is
heard from A/C evapo-
rator.Depending on the combination of the interior /
exterior temperatures, engine rpm and refriger-
ant pressure, the refrigerant flowing out of the
expansion valve may, under certain conditions,
make a whistling sound.At times, slightly decreasing refrig-
erant volume may stop this noise.
Inspect expansion valve and
replace if faulty.
Condition Possible Cause Correction
Blower fan motor
emits a chirping
sound in proportion to
its speed of rotation.Worn or damaged motor brushes or commuta-
tor.Repair or replace blower fan motor.
Fluttering noise or
large droning noise is
heard from blower fan
motor.Leaves or other debris introduced from fresh air
inlet to blower fan motor.Remove debris and make sure that
the screen at fresh air inlet is intact.

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Performance Diagnosis
1) Confirm that vehicle and environmental conditions are as fol-
lows.
Vehicle is not exposed to direct sun.
Ambient temperature is within 15 – 35 °C (59 – 95 °F).
2) Make sure that high pressure valve (1) and low pressure
valve (2) of manifold gauge set (3) are firmly closed.
3) Connect high pressure charging hose (4) to high pressure
service valve (5), and connect low pressure charging hose
(6) to low pressure service valve (7).
4) Bleed the air in charging hoses (4), (6) by loosening their
respective nuts on manifold gauge set (3), utilizing the refrig-
erant pressure. When a hissing sound is heard, immediately
tighten nut.
5) Warm up engine to normal operating temperature (engine
coolant temperature at 80 – 90 °C (176 – 194 °F)) and keep
it at specified idle speed. (Radiator cooling fan should not be
working when checking pressure and temperature.)
6) Turn A/C switch ON, and set blower switch at “HI” (3rd posi-
tion), temperature knob at “COOL” air outlet control knob at
“FACE” and fresh / circulation control knob at “CIRCULA-
TION”. (Confirm that A/C compressor and radiator / con-
denser cooling fan are working.)
Keep all windows, doors and engine food open.
Performance diagnosis condition
7) With dry bulb thermometer (1) inserted into center duct air
outlet and another one set near evaporator air inlet, read
temperature indicated on each thermometer. CAUTION:
Do not interchange high and low pressure charging
hoses by mistake.
Ambient temperature 15 – 35 °C (59 – 95 °F)
Engine rpm Keep to 1,500 rpm.
Blower fan motor switch “H” (3rd position)
Temperature control “Cool”
Air outlet control “Face”
Vehicle doors All open
Air inlet door position Recirculation

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8) Check if each pressure on low side and on high side is within
shaded range of the graph.
If each gauge reading is out of specified pressure, correct
defective part referring to “Performance Diagnosis Table” in
this section.
Low side and high side pressure example :
9) Check inlet port temperature-to-outlet port temperature rela-
tionship using graph.
For example, if evaporator inlet port temperature is 25 °C
(77 °F) and center duct air outlet temperature is 8 °C
(46.4 °F), their crossing point is within acceptable range as
shown in the graph.
If crossing point is out of acceptable range, diagnose trouble
referring to “Performance Diagnosis Table” in this section. NOTE:
Pressure registered on gauge varies with ambient tem-
perature. Therefore, use graph when determining if pres-
sures are normal or not.
Gauges should read as follows when ambient tempera-
ture is 30 °C (86 °F).
Pressure on high pres-
sure gauge1400 – 1750 kPa
14.0 – 17.5 kg/cm
2
199.1 – 248.9 psi
Pressure on low pressure
gauge230 – 350 kPa
2.3 – 3.5 kg/cm
2
32.7 – 49.8 psi

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CROSSING POINT OF CENTER VENTILATION LOUVER TEMPERATURE AND RECIRCULATION AIR
INLET TEMPERATURE
Detail diagnosis table (Ambient temperature at 30°C (86°F))
Condition Possible Cause Correction
Crossing point is
higher than accept-
able range
(“E” area)Insufficient or excessive charge of refrigerant Check refrigerant pressure
Dirty or bent A/C evaporator fins Clean or repair
Air leakage from cooling (heater) unit or air duct Repair or replace
Malfunctioning, switch over function of door in
cooling (heater) unitRepair or replace
Compressor malfunction Check compressor
Crossing point is
lower than acceptable
range
(“F” area)Insufficient air volume from center duct (Heater
blower malfunction)Check blower motor and fan
Compressor malfunction Check compressor
Condition
Possible Cause Correction MANIFOLD
GAUGEMPa
(kg/cm
2)
(psi)Detail
Lo Hi
0.23 – 0.35
(2.3 – 3.5)
(33 – 50)1.4 – 1.75
(14 – 17.5)
(200 – 249)Normal condition
––
Negative
pressure0.5 – 0.6
(5 – 6)
(71.2 – 85.3)The low pressure side
reads a negative pres-
sure, and the high pres-
sure side reads an
extremely low pressure.
Presence of frost
around tubing to and
from receiver / dryer
and expansion valve.Dust particles or water
droplets are either stuck
or frozen inside expan-
sion valve, preventing the
refrigerant from flowing.Clean expansion valve.
Replace it if it cannot be
cleaned.
Replace receiver / dryer.
Evacuate the A/C sys-
tem and recharge with
fresh refrigerant.
Normal :
0.23 – 0.35
(2.3 – 3.5)
(33 – 50)
↑
↑ ↑ ↑ ↓
↓↓ ↓
Abnormal :
Negative
pressureNormal :
1.4 – 1.75
(14 – 17.5)
(200 – 249)
↑
↑ ↑ ↑ ↓
↓↓ ↓
Abnormal :
0.69 – 0.98
(7 – 10)
(100 – 142)During A/C operation,
the low pressure side
sometimes indicates
negative pressure, and
sometimes normal
pressure. Also high
pressure side reading
fluctuates between the
abnormal and normal
pressure.Expansion valve is frozen
due to moisture in the
system, and temporarily
shuts off the refrigeration
cycle.Replace expansion valve.
Replace receiver / dryer.
Evacuate A/C system
and recharge with fresh
refrigerant.

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Electronical Diagnosis
Wiring Diagram
[A]: 4WD model 4. Dual pressure switch 9. Thermal switch 14. Circuit fuse box
[B]: 2WD model 5. 4WD controller 10. Ignition switch 15. Main fuse box
1. Blower fan motor 6. Condenser cooling fan motor relay 11. A/C evaporator thermistor 16. Generator
2. Blower fan motor resistor 7. Condenser cooling fan motor 12. ECT sensor 17. ECM
3. Blower fan motor switch and A/C switch 8. Compressor 13. Lighting switch

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Terminal arrangement of ECM coupler (Viewed from harness side)
1. Blower fan motor 8. Compressor [A]: To “A/C” fuse (25A) in main fuse box
2. Dual pressure switch 9. Thermal switch [B]: To “HEATER” fuse (20A) in circuit fuse box
3. A/C switch 10. Main relay [C]: To “FI” fuse (15A) in main fuse box
4. A/C evaporator thermistor 11. Engine earth [D]: 4WD model
5. ECT sensor 12. Blower fan motor switch [E]: 2WD model
6. Condenser cooling fan motor relay 13. 4WD controller
7. Condenser cooling fan motor 14. ECM

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ECM VOLTAGE VALUES TABLE FOR RELATION OF A/C CONTROL
Terminal Wire CircuitMeasurement
groundNormal value Condition
E18-1 PCompressor
magnet clutch
outputGround to
engine (Fig B)10 – 14 voltBlower fan motor switch and A/C
switch ON with engine running
0 – 1 voltsExcept the above-mentioned condi-
tion with engine running
E18-5 Bl/BMain power sup-
ply for ECMGround to
engine (Fig B)10 – 14 voltsIgnition switch ON with engine
stopped
E18-6 Bl/BMain power sup-
ply for ECMGround to
engine (Fig B)10 – 14 voltsIgnition switch ON with engine
stopped
E18-10 Bl Main relay driveGround to
engine (Fig B)0.5 – 1.2 voltIgnition switch ON with engine
stopped
0 volts Ignition switch OFF
E18-16 G/W A/C switch inputGround to
engine (Fig B)12 – 15 voltsBlower fan motor switch or A/C switch
OFF with engine running
0 – 1 voltBlower fan motor switch and A/C
switch ON with engine running
12 – 15 voltsWithin several seconds after operate
transfer lever between 2WD and 4WD
with above condition
E18-18 P/BCompressor
cooling fan relay
outputGround to
engine (Fig B)0 – 1 voltBlower fan motor switch and A/C
switch ON or engine coolant tempera-
ture at more than 110 °C (230 °F) with
engine running.
12 – 15 voltsExcept the above-mentioned condi-
tion with engine running
E18-20 B/BlSensor ground
for A/C evapora-
torGround to
body (Fig A)–0.5 – 0 volt Engine running
E18-24 Bl/YBlower fan
speed inputGround to
engine (Fig B)0 – 1 voltBlower fan motor switch 2nd or 3rd
with engine running
4 – 7 voltsBlower fan motor switch 1st with
engine running
12 – 15 voltsBlower fan motor switch and A/C
switch OFF with engine running
E19-1 BMain ground for
ECMGround to
engine (Fig A)–0.5 – 1 volt Engine running
E19-2 B/RECM ground for
power circuitGround to
engine (Fig A)–0.5 – 1 volt Engine running
E19-3 B/RECM ground for
power circuitGround to
engine (Fig A)–0.5 – 1 volt Engine running
E19-10 B/BlSensor ground
for ECT sensorGround to
body (Fig A)–0.5 – 1 volt Engine running

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E19-14 G/BECT sensor
inputGround to
engine (Fig B)0.73 – 0.83 volts
(315 – 355 Ω)Engine coolant temperature at
approximately 80 °C (176 °F) with
engine running
0.35 – 0.45 volts
(145 – 165 Ω)Engine coolant temperature at
approximately 110 °C (230 °F) with
engine running
*If the temperature is more than
113 °C (235 °F), compressor should
be stop (come back at less than
111 °C (232 °F)
E19-27 W/RA/C evaporator
thermistor tem-
perature inputGround to
engine (Fig B)2.0 – 2.3 volts
(1800 – 2200 Ω)Evaporator thermistor temperature at
approximately 25 °C (77 °F) with
engine running
3.5 – 3.6 volts
(6300 – 7000 Ω)Evaporator thermistor temperature at
approximately 0 °C (32 °F) with
engine running
*If the temperature is less than
approximately 2.5 °C (36.5 °F), com-
pressor cooling fan should be stop
(come back at less than approxi-
mately 4 °C (39.2 °F) Terminal Wire CircuitMeasurement
groundNormal value Condition

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WHEN REPLACING COMPRESSOR
Compressor oil is sealed in each new compressor by the amount
required for A/C system. Therefore, when using a new compres-
sor for replacement, drain oil from new compressor by the amount
calculated as follows.
“C” = “A” – “B”
“C” : Amount of oil to be drained
“A” : Amount of oil sealed in a new compressor
“B” : Amount of oil remaining in removed compressor
WHEN REPLACING OTHER PART
Replenish the following amount of oil to compressor.
Amount of compressor oil to be replenished
Evacuating
Evacuating procedure
Whenever opened (exposed to atmospheric air), A/C system
must be evacuated by using a vacuum pump.
1. New compressor
2. Removed compressor
Replaced part Amount of compressor oil to be
replenished
Evaporator
30 cm
3 (30 cc, 1.83 cu-in)
Condenser
30 cm
3 (30 cc, 1.83 cu-in)
Receiver / dryer
20 cm
3 (20 cc, 1.22 cu-in)
Hoses
10 cm
3 (10 cc, 0.61 cu-in) each
Pipes
10 cm
3 (10 cc, 0.61 cu-in) each
NOTE:
Do not evacuate before recovering refrigerant and replen-
ishing compressor oil.

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Removing Manifold Gauge Set
When A/C system has been charged with a specified amount of
refrigerant, remove manifold gauge set as follows:
1) Close low pressure side valve of manifold gauge set. (The
high pressure side valve is closed continuously during the
process of charging.)
2) Close refrigerant container valve.
3) Stop engine.
4) Using shop rag, remove charging hoses from service valves.
This operation must be performed rapidly.
5) Put caps on service valves.
Leak Test
Whenever a refrigerant leak is suspected in the system or any
service operation has been performed which may result in dis-
turbing lines or connections, it is advisable to test for leaks.
Common sense should be used in performing any refrigerant leak
test, since the need and extent of any such test will, in general,
depend upon the nature of a complaint and the type of a service
performed on the system.
LIQUID LEAK DETECTOR
There are a number of fittings and places throughout the air con-
ditioning system where a liquid leak detector solution may be
used to pinpoint refrigerant leaks.
By merely applying the solution to the area in question with a
swab, such as attached to the cap of a vial, bubbles will form
within seconds if there is a leak.
For confined areas, such as sections of the evaporator and con-
denser, an electronic (refrigerant) leak detector (1) is more practi-
cal for determining leaks.WARNING:
High pressure side is naturally under high pressure. So,
care must be used to protect your eyes and skin.